塔里木盆地南缘策勒绿洲区地下水TDS空间变异及水化学特征分析

摘要/Abstract

摘要： 基于策勒绿洲78个取样点的地下水的观测资料,结合地理信息系统,运用地统计学方法和Sigmaplot10.0中的Piper模块,研究塔里木盆地南缘策勒绿洲区地下水TDS（Total Dissolved Solids）的时空变异,揭示地下水水化学特征及其演变的主要水化学过程。结果表明:①地下水TDS存在强烈的空间相关性,其空间相关距离为4.4 km,在步长为6 km范围之内,地下水TDS的空间变异是各向同性的,当步长大于6 km时,4个方向上的半变异函数发生了不同的变化;②绿洲南部区域为地下水TDS的低值区,最小值为551 mg·L-1,由南向北地下水TDS呈增加的趋势,在北部地下水埋深低值区的TDS最大值为7 192 mg·L-1;从地下水水流方向上看,即从绿洲西南的低值区向北,再转向东北区方向,地下水TDS逐渐增加,最大值为3 677 mg·L-1;③浅层地下水化学类型变化复杂,主要从Na-Ca—SO4-Cl-HCO3、Na-Ca—SO4-Cl型向Na—SO4-Cl-HCO3和Na—SO4-Cl型演化。

关键词: 地下水TDS, 水化学, 空间变异, 策勒绿洲, 塔里木盆地

Abstract: Based on the groundwater observation data of the 78 sampling points in Cele oasis of the southern Tarim Basin, the spatial variability of groundwater TDS (Total Dissolved Solids), water chemical characteristics and the main evolution chemical process were analyzed with GIS, geostatistic method and Piper module of Sigmaplot10.0 software. The results indicated that: (1) Groundwater TDS was obviously space-related, and its space-related distance was 4.4 km. Anisotropic analysis showed the spatial variability of groundwater TDS was isotropic in the range of 6 km, while the spatial variability was anisotropic when the distance was beyond 6 km. (2) The result of Kriging interpolation indicated the groundwater TDS increased from south to north (from 551 mg·L-1 to 7 192 mg\5L-1); Along groundwater flow direction, the groundwater TDS increased from southwestern to the northeast oasis. (3) The water chemistry types of shallow groundwater were spatially complex, which changed from Na-Ca—SO4-Cl-HCO3 and Na-Ca—SO4-Cl to Na—SO4-Cl-HCO3 and Na—SO4-Cl.

Key words: groundwater TDS, water chemistry, spatial variability, Trim Basin, Cele oasis

中图分类号:

P641

代述勇;;雷加强*;赵景峰;谌莉; 杨光华;范敬龙;范冬冬;曾凡江. 塔里木盆地南缘策勒绿洲区地下水TDS空间变异及水化学特征分析[J]. 中国沙漠, 2010, 30(3): 722-729.

DAI Shu-yong;;LEI Jia-qiang;ZHAO Jing-feng;CHEN Li;YANG Guang-hua;FAN Jing-long;FAN Dong-dong;ZENG Fan-jiang. TDS-Spatial Variability and Chemical Characteristics of Groundwater in Cele Oasis of the Southern Tarim Basin[J]. JOURNAL OF DESERT RESEARCH, 2010, 30(3): 722-729.

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